Growli
Let's go

Plant care

Oregano (wild marjoram) care

Origanum vulgare

Also called wild marjoram, Greek oregano (subsp. hirtum).

RHS H5USDA 4-10Pet-safeIndoor 30-50 cm tall

Watering rhythm

7-10days

When the top 2 cm is dry, every 7-10 days

Jump to schedule→Get smart reminders in the app

Light

Direct sun (at least 4-6 hours)

Soil

Free-draining alkaline soil

Humidity

30-50% (outdoor)

Temp

15-27°C

Pet safety

Pet-safe

Mature size

30-50 cm tall

Care at a glance

Light

Oregano needs sun on the leaves, not just bright ambient room light. 6+ hours of direct sun for the best flavour. Tolerates light shade. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water oregano when the top 2 cm is dry, every 7-10 days. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Drought-tolerant once established. Overwatering produces lush bland leaves.

Soil and pot

Oregano grows best in free-draining alkaline soil. pH 6.5-7.5. Grit-amended compost or Mediterranean herb mix. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Oregano sits happiest at around 30-50% (outdoor) humidity and 15-27°C (60-80°F). Prefers dry air. If you keep the room above 15 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed oregano sparingly. Very light feeder; a top-dress of compost in spring is enough. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on oregano in the Growli community. Where a problem matches one of our diagnostic guides, click through for the full step-by-step recovery plan written for oregano specifically.

  • Loss of flavour — Over-fertilising or insufficient sun.
  • Woody centres — Plant ageing; divide and replant every 3-4 years.
  • Aphids on tender new growth — Rinse off with water or tolerate; ladybirds clean up quickly.
  • Yellowing after winter — Wet feet; improve drainage.

Companion plants

Oregano pairs well with Tomato, Pepper, Basil, and Squash. These are species with similar light and water needs, so you can grow them in the same bed or container without conflict.

Propagation

Division in spring, or softwood cuttings in late spring. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Oregano is pet-safe. Oregano is listed by the ASPCA as toxic to cats and dogs in large amounts due to essential oils, though small culinary nibbles are not a problem. Treat as low-risk and keep concentrated essential oils out of reach. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Oregano care — frequently asked questions

What is the common name for Origanum vulgare?

Origanum vulgare is most commonly called Oregano, but it is also known as wild marjoram, Greek oregano (subsp. hirtum). The names refer to the same species, so care instructions for Oregano apply identically to anything sold as wild marjoram.

How much light does oregano need?

Oregano grows best in direct sun (at least 4-6 hours). 6+ hours of direct sun for the best flavour. Tolerates light shade.

How often should I water oregano?

Water oregano when the top 2 cm is dry, every 7-10 days. Drought-tolerant once established. Overwatering produces lush bland leaves. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is oregano toxic to cats and dogs?

Oregano is pet-safe. Oregano is listed by the ASPCA as toxic to cats and dogs in large amounts due to essential oils, though small culinary nibbles are not a problem. Treat as low-risk and keep concentrated essential oils out of reach.

What USDA hardiness zone does oregano grow in?

Oregano is rated for USDA zone 4-10 and RHS hardiness H5. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Oregano deep-dive guides

Every aspect of oregano care, each with its own calibrated guide:

Featured in these plant shortlists

Oregano qualifies for 1 curated Growli shortlist — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Oregano is also commonly called wild marjoram or Greek oregano (subsp. hirtum).